A system administrator is provisioning storage hardware for a rackmount server. The server features an onboard Serial Attached SCSI (SAS) host controller connected to a drive backplane, as well as an M.2 2280 expansion slot that is connected exclusively to four dedicated PCIe lanes (M-key) with no SATA controller routing. Which of the following statements regarding drive compatibility and protocol support for this configuration are correct? (Select TWO.)
- SATA hard drives can be installed into the SAS backplane and managed by the SAS host controller.Cevap
- Only NVMe M.2 solid-state drives will function properly in the onboard M.2 expansion slot.Cevap
- CAn M.2 SATA SSD will function in the onboard M.2 slot at SATA III speeds because all M-keyed slots support SATA drives.
- DAn M.2 NVMe SSD installed in the motherboard slot will automatically revert to AHCI transfer mode if PCIe bandwidth is saturated.
Cevap
SATA hard drives are compatible with SAS controllers and backplanes, and the PCIe-only M.2 slot requires an NVMe M.2 solid-state drive.
SAS host controllers and backplanes are designed with backward compatibility for SATA drives via the Serial ATA Tunneling Protocol (STP). Furthermore, when an M.2 slot is wired exclusively to PCIe lanes, only NVMe drives (which communicate over PCIe) will function, as there is no underlying SATA bus connection for SATA-based M.2 drives.
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Anahtar Kavram
SAS backward compatibility with SATA drives and M.2 PCIe/NVMe protocol constraints